Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 df2ebf08be5e66a4…

MALICIOUS

Office (OOXML)

29.0 KB Created: 2021-06-08 07:44:17 UTC Authoring application: Microsoft Excel 16.0300
MD5: 19df06aa006e2f9ed817f431b3a2bd6b SHA-1: 9fef3022863693242ef9ff2d411e8f64bdd3f0a0 SHA-256: df2ebf08be5e66a45df93b820287c2c6b66f054e6c4e3c102fd2b92bd91bbfe6
202 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer

The Workbook_Open macro is designed to execute automatically when the document is opened. It constructs the string 'powershell' and uses CreateObject to download a file from the specified URL, saving it as 'C:\test\wp1\file.csv'. The script then appears to prepare for execution of this downloaded file, indicating a downloader pattern.

Heuristics 6

  • VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC
    VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://YourWebSite.com/?your_query_parameters

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
c11d9432d49eae217da881e812a108bfb9d23258f18ee76ae4949257907cbbb8		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1687 bytes
vbaProject_00.bin
b092b9614de127824d948afb5b722e365efbe3133739b0abf5cc7eb544ba0442		 vba-project OOXML VBA project: xl/vbaProject.bin 18944 bytes

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